gitlab-ci: fix 'needs' property type must be array

gitlab-ci: fix 'needs' property type must be array

The gitlab "Pipeline editor" has some warnings, and gitlab-ci-local
fails.

Read also from the docs

   https://docs.gitlab.com/ci/yaml/#needs

"Supported values:

    An array of jobs (maximum of 50 jobs).
    An empty array ([]), to set the job to start as soon as the pipeline
    is created."

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20250924120426.2158655-3-marcandre.lureau@redhat.com>